Sulfur poisoning of nickel methanation catalysts, part 1: in situ deactivation by H/sub 2/S of nickel and nickel bimetallics
Brigham Young University has investigated the effects of exposure to dilute H/sub 2/S during reaction upon the methanation activity of alumina-supported nickel, cobalt, and nickel-bimetallic catalysts in powder, pellet, and monolith form. Results of activity tests at 486/sup 0/F (525 K), 1 atm, and a space velocity of 30,000/hr with 10 ppm H/sub 2/S in the reactant stream show that cobalt and most nickel-bimetallic catalysts are not significantly more nor less sulfur-tolerant than nickel; Ni-MoO/sub 3/, however, is more active before, during, and after exposure to H/sub 2/S. The data also indicate that monolithic catalysts are significantly more sulfur-resistant than either powder or pellet catalysts. All of these catalysts, however, are completely deactivated within a period of 2-3 days under the conditions investigated. During reaction in the presence of H/sub 2/S, methanation activity decreases exponentially, accompanied by a gradual breakthrough of the poison. Less sulfur is adsorbed on the catalyst during reaction than would be if equilibrium adsorption occurred. Data show the roles of temperature, gas composition, and catalyst geometry in the poisoning process. Treatment with CO/O/sub 2/ and O/sub 2/, followed by a mild re-reduction, can partially regenerate the poisoned catalysts.
- OSTI ID:
- 5205172
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 60:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sulfur poisoning of nickel methanation catalysts
Alloy catalysts with monolith supports for methanation of coal-derived gases. Final technical progress report, September 20, 1977-September 20, 1980
Related Subjects
010403* -- Coal & Coal Products-- Hydrogenation-- (-1987)
BIMETALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT
DEACTIVATION
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
KINETICS
METALS
METHANATION
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NICKEL
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTICLE SIZE
POISONING
REACTION KINETICS
REGENERATION
SIZE
SULFIDES
SULFUR COMPOUNDS
THERMODYNAMIC ACTIVITY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS